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Mysterious Green Bands

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Dennis Dean
Mysterious Green Bands
on Sep 14, 2011 at 2:49:24 pm

I'm getting two mysterious light green horizontal bands in an .m4v using the H.264 for Apple TV - setting.... produced through Compressor from FCP -

The bands are NOT in Final Cut - and appear only in the mp4 when played on my laptop (which I presume is a display issue - this display seems more sensitive to everything.)

Here's a link to a screen grab:

http://deangroupmedia.com/clients/temp-green-band.jpg

The banding does NOT appear in all sections of the video - and I can't find any common threads among the areas where it does appear -

Any thoughts appreciated.

DD

Dennis Dean
The Dean Group
-It's about results-
http://www.deangroup.com


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Wayne Carey
Re: Mysterious Green Bands
on Sep 14, 2011 at 3:10:08 pm

Do you have a 2009 MacBook Pro?

If so, we have the same issue in the blacks. It is under Apple Care and we just have to find time to send it in for repair.

The problem lies with the internal video card on this laptop and Apple is aware of the problem but its only with a select few laptops that are seeing this issue.

_______________________________

Wayne Carey
Schazam Productions
http://web.mac.com/schazamproductions
schazamproductions@mac.com


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Jean-Christophe Boulay
Re: Mysterious Green Bands
on Sep 14, 2011 at 6:12:40 pm

I've seen these bands on many h.264 exports. The funky thing is you don't really see them if you're squarely in front of your LCD, they only appear if you look off-axis, which explains why you see them so readily on your laptop. The image you posted looks fine on my monitor, but if I turn it 45 degrees off axis the bands appear.

I've personally only seen this issue with h.264, in either an .m4v or .mov container, when exporting in a resolution smaller than the source through compressor. And not on all of them. I admit I never really looked too hard for a solution, as we use that codec mainly for client approvals. The clients that did see the bands were comforted with an export in another codec or a full-res screen grab, where they disappeared.

So I don't have a solution for you, but it's not a hardware issue with your laptop.

IHTH,

JC Boulay
Technical Director
Audio Z
Montreal, Canada
http://www.audioz.com


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Dennis Dean
Re: Mysterious Green Bands
on Sep 15, 2011 at 3:29:15 pm

Jean Christophe wrote: "I've personally only seen this issue with h.264, in either an .m4v or .mov container, when exporting in a resolution smaller than the source through compressor. And not on all of them."

That seems to be exactly what's happening here. Normally I export a full size Quick Time from Final Cut, then drop that into Compressor to create the .m4v. THIS time, I exported from FCP into Compressor to create the .m4v. It took forever and a day, (probably creating all the green bands.) It also added some orange discoloration to some scenes. NONE of this shows on my normal monitors, only on the laptop.

Solution = Abandon Compressor for this type of work flow - . Export an Mpeg 4 from MPEG Stream Clip.

Thanks for your help and insight -

DD

Dennis Dean
The Dean Group
-It's about results-
http://www.deangroup.com


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